How popular is Ameriko?

Ameriko is an unusual given name for males. Ameriko is an equally uncommon surname for all people. (2000 U.S. Demographics)

Which version is better?

with its source form and related boy names. Amerigo and Americo are the prominent varying forms of Ameriko (not ranked). Other variants, like Amerika, are seldom used. Adoption of these relations of Ameriko reached its apex 105 years ago (median #1051). (Top Baby Names, 2015)